package com.jason.javabase;

import java.util.ArrayList;

/**
 * @description:
 * @author: jason.jia
 * @create: 2019-01-25 14:42
 **/
public class TestBox extends ArrayList{
    Integer i;
    int j;

    public static void main(String[] args) {
        TestBox t = new TestBox();
        t.go();
    }

    public void go() {
        j=i;
        System.out.println(j);
        System.out.println(i);
    }
}
